Add "partition table"

uf2daemon/fat.c

@@ -42,6 +42,18 @@
 
 #define DBG LOG
 
+const uint8_t paritionTable[] = {
+    0xa0, 0x8b, 0x48, 0xf8, // signature
+    0x00, 0x00,             // not copy protected
+                            // part 1:
+    0x00,                   // not bootable
+    0x20, 0x21, 0x00,       // head/... start
+    0x06,                   // FAT16
+    0x0b, 0x2f, 0x04,       // head/... end
+    0x00, 0x08, 0x00, 0x00, // LBA start
+    0xe8, 0xf5, 0x00, 0x00, // LBA len
+};
+
 typedef struct {
     uint8_t JumpInstruction[3];
     uint8_t OEMInfo[8];
@@ -709,6 +721,18 @@ void readBlock(uint8_t *dest, int blkno) {
 
 void read_block(uint32_t block_no, uint8_t *data) {
     memset(data, 0, 512);
+
+    if (block_no == 0) {
+        memcpy(&data[440], paritionTable, sizeof(paritionTable));
+        data[510] = 0x55;
+        data[511] = 0xaa;
+        return;
+    }
+
+    if (block_no < 2048)
+        return;
+    
+    block_no -= 2048;
     uint32_t sectionIdx = block_no;
 
     if (block_no == 0) {

uf2daemon/main.c

@@ -22,7 +22,7 @@
 
 const char *dev_file = "/dev/nbd0";
 
-#define NUM_BLOCKS NUM_FAT_BLOCKS
+#define NUM_BLOCKS (NUM_FAT_BLOCKS + 2048)
 
 uint64_t ntohll(uint64_t a) {
     return ((uint64_t)ntohl(a & 0xffffffff) << 32) | ntohl(a >> 32);

uf2daemon/uf2.h

@@ -12,7 +12,7 @@
 #define UF2_VERSION_BASE "v0.1.0"
 
 // needs to be more than ~4200 and less than ~65000 (to force FAT16)
-#define NUM_FAT_BLOCKS 65000
+#define NUM_FAT_BLOCKS 62952
 
 #define UF2_VERSION UF2_VERSION_BASE " F"